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org.apache.commons.jexl (Commons JEXL 1.1-hudson-20090508 API)
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<H2>
Package org.apache.commons.jexl
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Provides a framework for evaluating JEXL expressions.
<P>
<B>See:</B>
<BR>
<A HREF="#package_description"><B>Description</B></A>
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<B>Interface Summary</B></FONT></TH>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/Expression.html" title="interface in org.apache.commons.jexl">Expression</A></B></TD>
<TD>
Represents a single JEXL expression.</TD>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/JexlContext.html" title="interface in org.apache.commons.jexl">JexlContext</A></B></TD>
<TD>Holds a Map of variables which are referenced in a JEXL expression.</TD>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/JexlExprResolver.html" title="interface in org.apache.commons.jexl">JexlExprResolver</A></B></TD>
<TD>A Resolver allows custom resolution of the expression, and can be
added in front of the jexl engine, or after in the evaluation.</TD>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/Script.html" title="interface in org.apache.commons.jexl">Script</A></B></TD>
<TD>A JEXL Script.</TD>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/ExpressionFactory.html" title="class in org.apache.commons.jexl">ExpressionFactory</A></B></TD>
<TD>
Creates Expression objects.</TD>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/JexlHelper.html" title="class in org.apache.commons.jexl">JexlHelper</A></B></TD>
<TD>Helper to create a context.</TD>
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Creates <A HREF="../../../../org/apache/commons/jexl/Script.html" title="interface in org.apache.commons.jexl"><CODE>Script</CODE></A>s.</TD>
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<TD WIDTH="15%"><B><A HREF="../../../../org/apache/commons/jexl/JexlException.html" title="class in org.apache.commons.jexl">JexlException</A></B></TD>
<TD>Signals an error inside JEXL.</TD>
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<A NAME="package_description"><!-- --></A><H2>
Package org.apache.commons.jexl Description
</H2>
<P>
Provides a framework for evaluating JEXL expressions.
<br><br>
<p>
<ul>
<li><a href="#intro">Introduction</a></li>
<li><a href="#example">Brief Example</a></li>
</ul>
</p>
<h2><a name="intro">Introduction</a></h2>
<p>
Java Expression Language (JEXL) is an expression language engine which can be
embedded in applications and frameworks. JEXL is inspired by Jakarta Velocity
and the Expression Language defined in the JavaServer Pages Standard Tag Library
version 1.1 (JSTL) and JavaServer Pages version 2.0 (JSP).
</p>
<p>
JEXL attempts to bring some of the lessons learned by the Velocity
community about expression languages in templating to a wider audience.
<a href="http://commons.apache.org/jelly">Commons Jelly needed</a>
Velocity-ish method access, it just had to have it.
</p>
<p>
It must be noted that JEXL is not a compatibile implementation of EL as defined
in JSTL 1.1 (JSR-052) or JSP 2.0 (JSR-152). For a compatible implementation of
these specifications, see the <a href="http://commons.apache.org/el">
Commons EL</a> project.
</p>
<h2><a name="example">A Brief Example</a></h2>
<p>
When evaluating expressions, JEXL merges an
<a href="http://commons.apache.org/jexl/apidocs/org/apache/commons/jexl/Expression.html">Expression</a>
with a
<a href="http://commons.apache.org/jexl/apidocs/org/apache/commons/jexl/JexlContext.html">JexlContext</a>.
An Expression is created using
<a href="http://commons.apache.org/jexl/apidocs/org/apache/commons/jexl/ExpressionFactory.html#createExpression(java.lang.String)">ExpressionFactory.createExpression()</a>,
passing a String containing valid JEXL syntax. A JexlContext is created using
<a href="http://commons.apache.org/jexl/apidocs/org/apache/commons/jexl/JexlHelper.html#createContext()">JexlHelper.createContext()</a>,
and variables are put into a map exposed through the
<a href="http://commons.apache.org/jexl/apidocs/org/apache/commons/jexl/JexlContext.html#getVars()">getVars()</a>
method on JexlContext. The following example, takes a variable named foo, and
invokes the bar() method on the property innerFoo:
</p>
<pre>
// Create an expression object
String jexlExp = "foo.innerFoo.bar()";
Expression e = ExpressionFactory.createExpression( jexlExp );
// Create a context and add data
JexlContext jc = JexlHelper.createContext();
jc.getVars().put("foo", new Foo() );
// Now evaluate the expression, getting the result
Object o = e.evaluate(jc);</pre>
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